code: def __init__(self):
      # adjacency[i][j] = True means j is a successor of i
      self._adjacency = {}
      self._edges = {}
  
file_path: catboost/contrib/python/pythran/pythran/graph.py
label_desc: Use image node_id 1 to create a new DiGraph object from inherited base classes: object with example: obj = DiGraph()